How much graphic card memory I need to run minecraft shaders with the realistic clouds? (RE UPLOAD)?

I have a ASUS computer that has 12 gb and 17 core and 765m graphic card if that compatible enough to run minecraft shaders with realistic clouds with realistic water please let me know.

Please in your answer let me know if it is compatible for my computer Thanks

12GB RAM is plenty (You can use 8GB), and the 765M GPU is a good GPU, so I think that it should run at at least 20 fps on 1x shaders res, although I can't be sure